Johnson Controls MS-NAE55 Series Installation Instructions Manual page 8

Table 2: Guidelines for BACnet Protocol MS/TP Network Topology
Category
General
Number of Devices
Line Length and Type
2
Cable Type
Terminations
1. If TEC Thermostat Controllers or third-party devices are used on the FC Bus, the maximum total number of devices is 32
and the maximum length is 1,219 m (4,000 ft).
2. Refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034) for information on cable types and lengths.
Table 3: NAE Ethernet Network Rules
Category
General
Number of Devices
Line Length and Type
Terminations
1. Refer to the N1 Ethernet/IP Network Technical Bulletin (LIT-6360175) for recommended parts and part numbers.
Table 4: Guidelines for L
Cable Type
Belden® 85102 Cable
Belden 8471 Cable
Level IV 22 AWG
JY (St.) Y 2 x 2 x 0.8
1. For the bus topology, the maximum length stub cable is 3 m (10 ft), and the stub lengths must be calculated into the overall
segment length.
Table 5: Guidelines for L
Cable Type
Belden 85102 Cable
Belden 8471 Cable
Level IV 22 AWG
JY (St.) Y 2 x 2 x 0.8
NAE55/NIE55 Installation Instructions
Rules/Maximums Allowed
MS-NAE55xx-x models (only) support up to two MS/TP Bus trunks, daisy chain topology only.
1
100 devices per FC Bus with no more than two repeaters between NAE55 and any device and
a maximum of 50 devices between repeaters
1,500 m (5,000 ft) cable without a repeater
4,500 m (15,000 ft) cable from NAE55 to the farthest FC Bus device (three bus segments of
1,500 m [5,000 ft] each, separated by repeaters)
2,000 m (6,600 ft) between two fiber modems
Stranded 0.6 mm (22 AWG) 3-wire twisted, shielded cable is recommended.
Stranded 0.6 mm (22 AWG) shielded 4-wire (two twisted-pairs) shielded cable is acceptable.
Note: The + and - bus leads should be a twisted pair. On applications using 4-wire
(two twisted-pairs) cable, isolate and insulate unused conductor. Refer to the
MS/TP Communications Bus Technical Bulletin (LIT-12011034) for more information.
Two FC devices with EOL switches in the ON position, one at each end of each FC Bus segment
Rules/Maximums Allowed
Star topology with network hubs/switches
Maximum of 100 devices can be connected to one site in the Metasys network.
2,000 m (6,600 ft) for plastic/glass fiber optic with external adapter
100 m (330 ft) CAT5 cable
For 10/100 BaseT, no line terminators allowed.
W Network Bus Topology
ON ORKS
Maximum Segment Length with
FTT10 Devices Only
2,700 m (8,850 ft)
2,700 m (8,850 ft)
1,400 m (4,600 ft)
900 m (2,950 ft)
W Network Free Topology
ON ORKS
Maximum Node-to-Node Distance
500 m (1,640 ft)
500 m (1,640 ft)
400 m (1,300 ft)
320 m (1,050 ft)
1
Maximum Segment Length with
1
FTT10 and/or LPT10 Devices
2,200 m (7,200 ft)
2,200 m (7,200 ft)
1,150 m (3,770 ft)
750 m (2,460 ft)
Maximum Segment Length with
FTT10 and/or LPT10 Devices
500 m (1,640 ft)
500 m (1,640 ft)
500 m (1,640 ft)
500 m (1,640 ft)
1
7